An alternative way of using the tide to generate
electricity is seen below. As the tide comes in, sea water is allowed to
enter the dammed area behind the sea wall. This drives turbines that
produce electricity. The sluice gates are then shut to hold the sea
water behind the dam wall. When the tide goes out, the sea water from
inside the dam wall is allowed to flow back out by reopening the
sluice gates. As water flows through the slices, it drives the same
turbines which produce electricity a second time.
One of the few tidal power systems in the world is to be found in the
Rance Estuary in France. It was constructed in 1966 and works on the
principle seen below.

QUESTIONS:

1. Find the location of the Rance
Estuary on a map of France. Draw a simplified version of the map.

2. Find a photograph of the Rance
Estuary tidal power station on the internet.